While several planets have tilts like our own, which jovian world has the most extreme tilt, with observable atmospheric seasonal changes now being studied closely for the first time?

The answer is Uranus.

Explanation:

To start with, a Jovian world is a planet that does not have a solid surface. Instead, the planet is made up of primary gasses like helium and hydrogen. There are also traces of water, ammonia, methane and other gasses in the atmosphere of a Jovian planet.

There are four Jovian worlds in the solar system they include Saturn, Jupiter, Neptune and Uranus. Out of the four planets, Uranus has the most extreme tilt at 98 degrees. Saturn is tilted by 27 degrees, Jupiter has a tilt of 3.13 degrees while Neptune is tilted by 28.32 degrees.

Also, Uranus has extreme atmospheric seasonal changes that are observable due to its extreme tilt.